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turn monitor off and on

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  turn monitor off and on Astan Chee <astan.chee@gmail.com> - 2011-05-14 16:08 +1000
    Re: turn monitor off and on harrismh777 <harrismh777@charter.net> - 2011-05-14 02:13 -0500
      Re: turn monitor off and on harrismh777 <harrismh777@charter.net> - 2011-05-14 02:20 -0500
        Re: turn monitor off and on harrismh777 <harrismh777@charter.net> - 2011-05-14 02:29 -0500
          Re: turn monitor off and on Alexander Kapps <alex.kapps@web.de> - 2011-05-14 09:59 +0200
        Re: turn monitor off and on Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-14 07:43 +0000
          Re: turn monitor off and on harrismh777 <harrismh777@charter.net> - 2011-05-14 03:05 -0500
        Re: turn monitor off and on Terry Reedy <tjreedy@udel.edu> - 2011-05-14 15:58 -0400
          Re: turn monitor off and on harrismh777 <harrismh777@charter.net> - 2011-05-14 19:25 -0500
          Re: turn monitor off and on Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-16 12:00 +1200
            Re: turn monitor off and on harrismh777 <harrismh777@charter.net> - 2011-05-15 20:48 -0500

#5337 — turn monitor off and on

Hi,
I'm trying to turn off my monitor, pause and then turn it on again.
I'm doing this in python 2.6 and windows xp. Here is my script so far
(that doesn't work):

import time
import win32gui
import win32con
import win32api

def turnOffMonitor():
  SC_MONITORPOWER = 0xF170
  win32gui.SendMessage(win32con.HWND_BROADCAST,
win32con.WM_SYSCOMMAND, SC_MONITORPOWER, 2)

def turnOnMonitor():
  SC_MONITORPOWER = 0xF170
  win32gui.SendMessage(win32con.HWND_BROADCAST,
win32con.WM_SYSCOMMAND, SC_MONITORPOWER, -1)

if __name__ == "__main__":
  turnOffMonitor()
  time.sleep(5)
  turnOnMonitor()

For some reason, the script doesn't turn the monitor back on. What am
I doing wrong here or are there any other alternative?

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#5340

Astan Chee wrote:
> import time
> import win32gui
> import win32con
> import win32api
>
> def turnOffMonitor():
>    SC_MONITORPOWER = 0xF170
>    win32gui.SendMessage(win32con.HWND_BROADCAST,
> win32con.WM_SYSCOMMAND, SC_MONITORPOWER, 2)
>
> def turnOnMonitor():
>    SC_MONITORPOWER = 0xF170
>    win32gui.SendMessage(win32con.HWND_BROADCAST,
> win32con.WM_SYSCOMMAND, SC_MONITORPOWER, -1)
>
> if __name__ == "__main__":
>    turnOffMonitor()
>    time.sleep(5)
>    turnOnMonitor()


What we need here is a matching script that turns off WinXP and leaves 
it off too...



...  ouch, <sorry, couldn't help myself>    :)



lol
m harris

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#5341

harrismh777 wrote:
>
> def turnOnMonitor():
>     SC_MONITORPOWER = 0xF170
>     win32gui.SendMessage(win32con.HWND_BROADCAST,
> win32con.WM_SYSCOMMAND, SC_MONITORPOWER, -1)


I've never tried turning my monitor on/off without using my finger... 
gonna have to play with this...  wouldn't that be a great script kiddie 
tool... just turn off all the windows monitors around the world... no 
problem(s) after that...

... what happens if you try to turn it back on with your finger... ?

... I have another idea... while its off, try pushing the alt key on 
your keyboard... or moving your mouse... (come back on ? )







kind regards,
m harris

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#5343

harrismh777 wrote:
>>
>> def turnOnMonitor():
>>     SC_MONITORPOWER = 0xF170
>>     win32gui.SendMessage(win32con.HWND_BROADCAST,
>> win32con.WM_SYSCOMMAND, SC_MONITORPOWER, -1)


Wonder what the equivalent of this is in Linux... ?

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#5348

On 14.05.2011 09:29, harrismh777 wrote:
> harrismh777 wrote:
>>>
>>> def turnOnMonitor():
>>> SC_MONITORPOWER = 0xF170
>>> win32gui.SendMessage(win32con.HWND_BROADCAST,
>>> win32con.WM_SYSCOMMAND, SC_MONITORPOWER, -1)
>
>
> Wonder what the equivalent of this is in Linux... ?

Probably xset dpms force {on,off,...}

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#5346

On Sat, 14 May 2011 02:20:55 -0500, harrismh777 wrote:

> harrismh777 wrote:
>>
>> def turnOnMonitor():
>>     SC_MONITORPOWER = 0xF170
>>     win32gui.SendMessage(win32con.HWND_BROADCAST,
>> win32con.WM_SYSCOMMAND, SC_MONITORPOWER, -1)
> 
> 
> I've never tried turning my monitor on/off without using my finger...

You've never had your PC turn your monitor off after X minutes of 
inactivity?


> gonna have to play with this...  wouldn't that be a great script kiddie
> tool... just turn off all the windows monitors around the world... no
> problem(s) after that...
> 
> ... what happens if you try to turn it back on with your finger... ?

Then you actually turn it off, at the power switch, instead of merely off 
in software.


> ... I have another idea... while its off, try pushing the alt key on
> your keyboard... or moving your mouse... (come back on ? )

Presumably you would need to program something to watch for activity and 
turn it back on. It would be somewhat embarrassing if you neglected to so 
this...


-- 
Steven

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#5349

Steven D'Aprano wrote:
>> I've never tried turning my monitor on/off without using my finger...

> You've never had your PC turn your monitor off after X minutes of
> inactivity?

I know you're being funny, but actually, no-- I don't.


That's a back-in-the-day thing...   all of my monitors (and I only have 
a couple now because I use VNC to get to the rest of my machines) are 
flat panel LED, very low power, cool, and virtually indestructible. I 
just leave them on... with beautiful screen savers running... which 
aren't screen savers these days either... because nothing really 
burns... more like perpetual light-candy eye-pleasers...

Sure, back in the day I configured my system to shutoff the CRT... but 
honestly, I haven't had a CRT for almost a decade...  you can still 
shutdown the flat panel several different ways on the linux platform 
based on timing if you want to... in BIOS, in the OS, in gnome, using 
the xscreensaver, etc...    but, no, I have never written a code routine 
to shutoff the monitor (my finger always worked just fine).  :)

I wrote a code routine one time just to open the drive bay door, 
timer(), and then close the door... from across the network...   until 
my wife got wise to it, I would open her drive bay door over the 
network... it was fun for a while, even after she got wise to it...


... till the morning I tried it and she had a cup of cocoa sitting on 
the desk in front of the drive bay...


... there have been better days in my house.   :)

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#5382

On 5/14/2011 3:20 AM, harrismh777 wrote:
> harrismh777 wrote:
>>
>> def turnOnMonitor():
>> SC_MONITORPOWER = 0xF170
>> win32gui.SendMessage(win32con.HWND_BROADCAST,
>> win32con.WM_SYSCOMMAND, SC_MONITORPOWER, -1)
>
>
> I've never tried turning my monitor on/off without using my finger...

The computer cannot turn off the monitor. It can only tell the graphics 
card to turnoff the signal to the monitor. My monitor then displays 'No 
signal detected' in a box and puts itself into a low-power state 
awaiting a signal. Even if the monitor does not do that, a black screen 
should use less power.

Why the turnon does not work, if indeed it does not (and the monitor is 
not failing to respond to its resumption) is not a Python question. 2 
and -1 as off and on parameters is a bit strange. The OP might try a 
different api reference source or ask on a windows innards list.

-- 
Terry Jan Reedy

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#5395

Terry Reedy wrote:
> The computer cannot turn off the monitor.

... this was my point       ;-)

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#5450

Terry Reedy wrote:
> My monitor then displays 'No 
> signal detected' in a box and puts itself into a low-power state 
> awaiting a signal. Even if the monitor does not do that, a black screen 
> should use less power.

I'm not so sure about that. If the monitor is an LCD and isn't
doing anything to reduce its own power usage, then the backlight
is still running and using just as much power, whether the screen
is black or not.

-- 
Greg

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#5458

Gregory Ewing wrote:
> I'm not so sure about that. If the monitor is an LCD and isn't
> doing anything to reduce its own power usage, then the backlight
> is still running and using just as much power, whether the screen
> is black or not.

Depends on dpmi.  Some monitors turn off the backlight, and some don't. 
My monitor(s) that are LCD turn off the backlight... and the downside of 
that (very annoying) is that they have to 'warm up' again... making them 
dim for the first few seconds of use...

An LED flat panel is a completely different animal, because there is no 
backlight (no ccfl). They monitors don't use much power in the first 
place, but they use less when they're blank, obviously, not producing light.

kind regards,
m harris

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